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php mysql 数据表获取字段名,长度,信息

Jun 13, 2016 am 10:08 AM
mysql php interaction information function use Can Field powerful data sheet of Related Obtain length

强大的php可以利用mysql交互的相关函数可以获取数据表的字段信息,如可以获取数据表获取字段名,字段长度,字段信息等。

强大的php教程可以利用mysql教程交互的相关函数可以获取数据表的字段信息,如可以获取数据表获取字段名,字段长度,字段信息等。
*/
$hostname="localhost";         //定义连接到的mysql服务器名
$username="root";          //定义用于连接的用户名
$password="";           //定义用于连接的密码
$link=mysql_connect($hostname,$username,$password);   //打开mysql连接
$db_list=mysql_list_dbs($link);        //列出数据库教程
$rows=mysql_num_rows($db_list);       //取得返回结果数
$i=0;
while($i {
  echo mysql_db_name($db_list,$i)."n";      //输出对象内容
  echo "

n";
  $i++;
}
mysql_close($link);          //关闭mysql连接

//返回列的长度

$sql_str="select * from friends where id=1";     //定义sql语句
$result=mysql_query($sql_str);        //执行sql语句
$re_a=mysql_fetch_array($result);
$re_len=mysql_fetch_lengths($result);
for($i=0;$i {
  echo "返回结果的第".$i."列的长度为:".$re_len[$i];
  echo "

";
}
mysql_close($link); 

//获取字段信息

$result=mysql_query("select * from friends");     //执行sql查询
/*获取字段信息*/
$i=0;
while($i {
  $i++;
  echo "第".$i."列的信息:
n";
  $meta=mysql_fetch_field($result);       //获取字段信息
  if(!$meta)           //如果值不存在
  {
    echo "no information available
n";     //输出无可用信息
  }
  echo "

<br>
blob:     $meta->blob <br>
max_length:   $meta->max_length<br>
multiple_key:  $meta->multiple_key<br>
name:        $meta->name<br>
not_null:      $meta->not_null<br>
numeric:      $meta->numeric<br>
primary_key:  $meta->primary_key<br>
table:         $meta->table<br>
type:         $meta->type<br>
unique_key:  $meta->unique_key<br>
unsigned:    $meta->unsigned<br>
zerofill:       $meta->zerofill<br>
Copy after login
";            //结束去格式输出

//mysql_field_flags() 函数从结果中取得和指定字段关联的标志。
$re_field=mysql_field_flags($result,0);
$flag=explode(" ",$re_field);
print_r($flag);
$re_field=mysql_field_flags($result,1);
$flag=explode(" ",$re_field);

//列名

$result=mysql_query($sql_str);        //执行sql语句
$re_name=mysql_field_name($result,0);      //获取第一个字段的名称
echo "第一个字段的名称为:".$re_name;
echo "

";
$re_name=mysql_field_name($result,1);      //获取第二个字段的名称
echo "第二个字段的名称为:".$re_name;
echo "

";
$re_name=mysql_field_name($result,2);      //获取第三个字段的名称
echo "第三个字段的名称为:".$re_name;
echo "

";
$re_name=mysql_field_name($result,3);      //获取第四个字段的名称
echo "第四个字段的名称为:".$re_name;
echo "

";
$re_name=mysql_field_name($result,4);      //获取第五个字段的名称
echo "第五个字段的名称为:".$re_name;
echo "

";

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